基于格网的东江流域生态安全空间综合评价

通过统计以往关于生态安全评价的文献,从众多指标中筛选出应用频率较高的指标作为构建生态安全评价指标体系的基础,运用压力-状态-响应(P-S-R)模型,采用熵权法确定评价指标的权重,建立了基于格网的东江流域生态安全评价指标体系,并用综合评分法对东江流域的生态安全状况进行了评价。结果表明:东江流域生态安全由2000年的较安全等级下降为2004年的较不安全等级,到2008年改善为很安全等级。可见,基于对照比较筛选以确定生态安全评价指标,可在很大程度上克服目前生态安全评价指标体系缺乏统一标准的不足;基于格网的生态安全评价,可消除行政界线变动带来的影响,并可反映区域内部的空间差异性,从而提高了研究结果的可信度。

Integrated spatial assessment of ecological security in Dongjiang River Basin based on gridding

Through the selection of the indicators highly frequently used in published literatures and by using pressure-state-response (P-S-R) model, an index system based on gridding for assessing the ecological security in Dongjiang River Basin was established. The selected indicators were weighted by entropy method, and then, integrated into the index system for the assessment. The results showed that the ecological security of Dongjiang River Basin was deteriorated from the relatively-secure level in 2000 to the less-secure level in 2004, and then, improved to the rather-secure level in 2008. The selected indicators that were applied to determine the index for assessing ecological security could largely overcome the lack of uniform standard in index system. The ecological security assessment based on gridding could remediate the impact of the changes in administrative boundary, and reflect the spatial differences within the region so as to improve the reliability of the assessment.